Telephone-transmitter



(No Model.)

I E. B'ERLINER. TELEPHONE TRANSMITTER.

Patented Sept. 18, 1883.

fl I C H w I,

N4 PETERS. Pnm-Lhhv mr. waning. no. 1

UNITED STATES PATENT OFFICE.

EMILE BERLINER, OF BOSTON, MASSACHUSETTS.

TELEPHONE-TRANSM ITTER,

SPECIFICATION forming part of Letters Patent No. 285,102, dated September 18, 1883.

Application filed June 13, 1883. (No model.)

To all whom it may concern:

Be it known that I, EMILE BERLINER, of Boston, in the county of Suffolk and-State of Massachusetts, have invented certain Improvements in Telephone-Transmitters, of which the following is a specification.

This invention relates to that class of telephone-transmitters which consist, essentially, of a vibrating medium, in combination with a tube or chamber containing loose conducting particles. In operating'suchtransmitters the mass of loose particles is compressed more or less at each vibration, and thereby its resistance is altered accordingly. It is, however, important to pack the particles together in order to insure a certain firm contaetbetween them; and my present invention consists in doing this by a weight resting permanently 011 said mass. The transmitter thereby becomes also self-adjusting.

Various other mechanical improvements, which I also describe below, are of secondary importance, and maybe varied or substituted without departing from the spirit of my invention.

In the drawing, A is a piece of stout hardrubber tubing, closed below by a metal diaphragm, To the center of the latter is screwed the metal or carbon block N. Into the tube is placed a mass, 0, of loose conducting particles, such as crushed coke, iron filings, or the like.

rests loosely a metal weight, I), to which is attached or screwed the metal stick E. This Upon this conducting mass stick slides through a hole, h, of the hard rubber bar F. Around the stick E,and upon said bar F, is situated a circular mercurytrough, G, and two wires, H H, which are soldered to said stick, dip into the mercury. A mouth-piece, K, is screwed to the tube A, and the whole apparatus stands best in a true vertical position, as shown. Two leading wires, and are soldered to the mercurytrough and to the diaphragm, respectively.

To operate this apparatus the two wires just mentioned are connected with a battery into a telephonic circuit, and theelectrical undulations are produced by speaking intothe tube K, according to well-known laws. The weight D is determined beforehand, and as it is capable of moving up and down freely it will re spond to any vibratory impulses which it may receive from the diaphragm through the conducting mass O.

I clain1- In a .telephone-transmitter, a tube or chamber containing a mass of loose conducting particles through which a current passes, and which particles are held together by a mov able weight resting on said mass, substantially as described. I

In testimony whereof I have signed my name to this specification, in the presence of two subscribingwitnesses, this 11th day of June, 1883.

EMILE BER-LINER.

Witnesses:

GEo. WVILLIs PIERCE,

J. H. GHEEVER. 

